Abstract
A traditional land rig uses tribble in drilling operation. A novel fourble land rig using four joints as a unit has been researched and developed in order to promote operational efficiency in ultra deep well drilling. Design, overall plan and crucial techniques as well as the field application result of the fourble drilling rig are presented in this paper.
The fourble land drilling rig was studied based on the conventional tribble rig which utilizes three joints as a unit or a tribble. However, the novel rig adopts four joints as a unit or a fourble. Therefore, the improvement of the drilling operational efficiency could be realized by extending the length of the stand, reducing trip time and frequency, and increasing the high speed operational time of the travelling block. The extra high derrick design, fourble handling and drum roping techniques of the 9000m fourble land rig were researched.
The fourble land drilling rig with nominal drilling depth of 9,000m was designed and manufactured. The heights of the derrick and racking platform of the fouble rig were increased. The rig is able to run in hole and pull out of hole the fourble united by four joints. The high speed tripping distance gets longer, and the setback capacity gets increased. Ultra deep well drilling in the piedmont zone of Tarim basin in Xinjiang, China showed the reliable integral performance and substantial enhancement of drilling speed. The average drilling time using the fourble rig could be 15%-30% decreased as compared to that of the traditional tribble rig. The cycle of drilling would be cut down and cost of drilling would be reduced for ultra deep wells by means of the fourble rig.
Oil and gas reservoirs were deep buried in depths of 7,000m-9,000m in the submountain area of Tarim basin where the ultra deep wells drilling are increasingly growing. The novel fourble land rig was developed in high demand of efficient drilling of ultra deep wells. It filled the gap of China's drilling rig series.
Research on Drilling Depth Measurement Technology based on Drilling Rig Parameter Monitoring
